Talking-machine stop



H. E. DAKIN.

TALKING MACHINE STOP.

APPLICATION man OCT. 31. 1921.

Patented Mar. 7, 1922.

IN VN 73E J /EPBEETZ ZA E57ZAV ,qrrdfi/v y UNITED STATES PATENT OFFICE.

HERBERT ERNEST DAKIN, OF LONDON, ENGLAND, ASSIGNOR TO BARNETT SAMUEL AND SONS, LIMITED, OF LONDON, ENGLAND, A CORPORATION OF GREAT BRITAIN.

TALKING-MACHINE STOP.

Application filed October 31, 1921.

To allwkom it may concern:

Be it known that I, HERBERT ERNEST DAKIN, a subject of the King of Great Britain and Ireland, residing at 3133 High Holborn, London, W. 0., England, have invented certain new and useful improvements in Talking-Machine Stops. (for which I have filed an application in England. April 24, 1920,) of which the following is a specification.

This invention relates to devices for auto matically stopping a talking machine when the stylus reaches the end of a record, and particularly to that type of apparatus in which the stopping device, such as a brake acting on the turn table, is held inoperative by the weight of the tone arm and is released when the tone arm reaches a predetermined position.

The object of the present invention is to facilitate the setting or adjustment of the automatic stopping device prior to each operation so that the turn table will be arrested immediately the record has been played, irrespective of the length of the record. 7

According to the invention a spring actuated brake is adapted to be held inoperative by the weight of the tonearm during the playing of a record, the tone-arm or a member connected thereto riding over and de pressing a plate which is adjustably mounted 011 the brake mechanism, so that the effective length of the plate, determining the period during which it is held depressed with the brake inoperative may be varied to suit the length of record to be played.

Moreover the plate is preferably adapted to be so engaged with the tone-arm or the aforesaid member connected thereto, at the end of the travel of'the same over the plate, that the adjustment of the platerelatively to the brake mechanism can be effected by a simple manual movement of the tone-arm into the Position corresponding to that in which the stylus is at the end of the record, or other point at which the brake is to act. The tone-arm is then disengaged from the plate (either by depressing the plate or by raising the tone arrn, according to the type of tone arm employed) and is moved back Specification of Letters Patent.

Patented Mar. 7, 1922.

Serial No. 511,764.

to bring the stylus at the starting point on the record.

In the accompanying drawings:

Fig. l is a perspective view of one form of automatic talking machine stopping device shown in position on the motor board of a talking machine, a portion of the tone-arm being indicated in dotted lines.

Figs. 2 and 3 are respectively a side elevation and plan of the stopping device detached, the brake lever being of aslightly modified form.

Figs. 4 and 5 are perspective views of other forms of the stopping device.

Fig. 6 is a perspective view of a further form especially designed for use with a tone-arm of the type which can only swivel in one plane.

Figs. 7 and 8 are respectively a perspective view and a rear elevation of a still further form adapted to be mounted on the hinge of the lid of a talking machine casmg.

In the form of the stopping device shown in Figs. 1 to 3, a brake lever 1, provided with a brake pad 2, for engagement with the edge of the turn-table 3, is pivoted at 4 in a bracket 5, secured to the motor board 6 of the talking machine. A spring 7 tends to maintain the lever with the pad 2 in contact with the turn table 8. The rear end 8 of the brake lever 1 is provided with a plate 9, which during the playing of a record, is depressed by the weight of the tone-arm, acting through a member 10 which ridesover the plate. While the plate 9 is depressed the brake ad 2 is withheld from the turn table 3. hen the member 10 rides oil the plate-9, for instance when it enters a slot 11, the brake lever 1 is moved by the spring 7 and forces the brake pad 2 into contact with the edge of the turn-table and ar rests the table. The lengthof the plate between the slot 11 and the starting position of the'mernber 10 thereon, determines the time during which the turn-table is free to rotate, and consequently the position of the tone-arm, and that. of the stylus on the record, when the turn table is arrested by the brake. In order to allow this effective length of the plate 9 to be varied to suit records of different length, the plate 9 is adj ustably mounted on the end 8 of the brake lever 1. For example the plate 9 has a slot 12. Two lugs 13 stamped out of the end 8 pass through the slot 12 and also through a spring washer 1 1 and are then bent over, so as to hold the washer 1 1 in position. The end 8 and plate 9 are curved approximately to a radius from the vertical axis about which the tone-arm swings. The plate 9 is thus slidably and frictionally held on the end 8 so that it can be readily adjusted thereon. It may be manually ad justed- It is preferred however to effect the adjustment by a manual movement of the tonearm, and for this purpose the tone-arm, through the medium out the member 10 is adapted to engage with the plate 9, for example the plate is provided with two upstanding stops 1 1, and 15. If the member 10 be on top of the plate 9 as shown in Fig. 1, and the tone-arm be then moved by hand outwardly the member 10 will engage with the stop 15 and the plate 9 will be slidden outwardly to its full extent and then arrest the tone-arm. It now it be desired to set or adjust the automatic stopping device so that it shall apply the brake and stop the turn-table immediately a particular record has'been'completely played, the tone-arm is moved inwardly until the member 10 engages the stop 14:. The brake lever 1 raises the plate 9, so that the member 10 is within the slot 11. The tone-arm is-then moved either inwardly or outwardly to bring the stylus to the exactpoint at the end 01' the record where the playing is to cease.

- This movement, owing to the engagement in practice.

between the member 10 of the tone-arm and the plate 9, ellects an automatic adjustment of the plate 9 on the end 8 of the brake lever 1, in other words it determines the effective length of the portion of, or track on the plate 9 over which the inen'iber 10 will ride. during the subsequent playing of the record. When this adjustment has been effected, the tone-arm is disengaged "from the plate 9 and moved outwardly to bring the stylus to the starting point on the record. The disengagement of the member 10 and the plate 9 may be effected by merely raising the tonearm or by manually depressing the plate 9. according as the tone-arm is of the type which is capable of universal. movement or the type which can onlybe moved in one plane, both types being commonly adopted When the stylus has been so placed at the starting point on the record, the weight of the tone-arm will hold the brake lever 1 inoperative so that the turntable is free to rotate. The stylus then travels across the record as usual until the member 10 rides ofi' theplate 9, and enters the slot .11 which occurs when the stylus relatively to the turn-table.

plate 17, secured to the brake lever bearing against the motor board and forcing the brake lever upwards. The leather or other pad 2 is adapted to be slidden along a slot 19 in the lever 1 to allow it to be adjusted The brake lever 1 has a finger piece 18 by which it can be depressed. Itsend 8 isadjustably fitted with a plate 9 as in the. form before described, similar reference numerals indicating corresponding part-s. 1

The form shown in Fig. 5 is similar to that shown in Fig. at, butthe member 10 on the tone-arm is arranged to ride on the fiat side of the plate instead of along an edge. Moreover the end 8 of the brake lever 1 is bent twice at right angles so that the end 8 and the plate 9 may overhang the record and turn-table. This arrangement is desirable when extra large records are used and extend in close the tone-arm.

The form shown in F 6 is similar to that shown in Figs. 1 to 3. Two screws 20 and washers are used to secure the plate 9 slidably and tt'rictionally to the end 8 of the brake lever 1. The lever 1 is also provided with a finger piece 18 by which it can be depressed.

In the form shown in Figs. 7 and 8 the brake lever 1 provided with a pad 2 for engagement with the underside of the turntable is pivotally mounted on the pin 22 of the hinge 23 of the lid of: the talking machine cabinet. Another lever 24 is also pivoted on the hinge pin 22. The plate 9 is ad justably mounted. on the end 8 of the lever 24; similarly to the plate 9 of the previous examples.

A spring 25 tends to move the brake lever 1 to bring its pad 2 into contact with the underside, ,ofthe spring 26 tends to distend the two levers 1 and 24 relatively to one another. When the tone-arm depresses the plate 9 and therefore the lever 24 it tensions the spring 26 which is sufliciently strong to overcome the lighter spring 25, so that the brake lever 1 is depressed and withdraws the pad 2 from the turn-table. When the member 10 rides off the plate 9 into the slot 11 the lever 24 rises, slacken's the spring 26 solthat the spring 25 applies the brake pad 2 to the tu n ta e. A h g2? F g.8. 0n the brake turn-table.- Another lever 1, near the hinge pin 23, prevents undue movement of the lever 22 when the tonearm, which may be of the type which is pivoted universally is raised and replaced to its starting point.

What I claim as my invention and desire to secure by Letters Patent in the United States of America is 1. A device for automatically stopping a talking machine comprising a swinging and spring actuated brake lever having a'plate, amember connected to the tone-arm of the talking machine adapted to ride over said plate during the playing of a record to depress the same and to hold the brake inoperative, said plate being adjustable relatively to said brake to permit of the effective length of the plate ridden over by the aforesaid member to be varied-to suit the length of record to be played and provided With means to permit the brake lever to move into operative position, and means for engaging said member and plate whereby said plate may be adjusted relatively to said brake, by manual movements of the tone arm, substantially as and for the purpose hereinbefore set forth. 1

2. A device for automatically stopping a talking machine, comprisinga pivoted and spring actuated brake lever, a plate carried by said lever, adapted to be depressed by a member on the tone-arm of the talking machine, as the tone-arm swings about its ver tical pivotal axis to hold said brake lever in an inoperative position, said plate having a slot for the reception of said member When it reaches said slot to allow said plate to rise and vpermit said brake lever to move into an operative position, said plate being adjustably mounted on said brake lever for the purpose of permitting of adjustment of the position of the slot in said plate relatively. to the starting position of the said tone-arm member on said plate and provided with stops to permit the plate to be moved relatively to the brake by the manual movement of the tone arm, substantially as and for the purpose hereinbefore set forth.

3. A device for stopping talking machines, comprising a swinging and spring pressed brake lever having an angular end, a plate slidably secured to the angular end of the brake lever and having an open slot in its upper edge, and a member carried by the tone arm adapted to ride over the plate to hold the brake in inoperative position during the playing of the record and to enter the slot of said plate to permit the brake lever to move into operative position.

4. A device for stopping talking machines, comprising a pivoted and spring-pressed brake lever having an angular end, a plate slidably secured to the angular end of the brake lever and provided with stops at its ends and with an open slot adjacent to one stop, and a member carried by the tone arm and adapted to ride upon said plate.

5. In a device for stopping a talking machine, a pivoted and spring pressed brake lever having an angular end, and a plate slidably and frictionally mounted on the angular end of the brake lever, said plate being adapted to be ridden over by a member of the tone arm and provided with stops on its upper edge and an open slot adjacent one stop.

6. In a device for stopping a talking machine, a pivoted and spring pressed brake lever having an angular end provided with lugs projecting therefrom, a longitudinally slotted plate in which the lugs of the brake lever project, and means for securing the said lugs in the slot of the plate so that 'the plate will be frictionally held, said plate being adapted to be ridden over by a member on the tone arm and provided with stops at its ends and an open slot adjacent one stop.

In testimony whereof I have affixed my signature.

HERBERT ERNEST DAKIN; 

